Instrument Microphone

The Shure KSM Microphone Series KSM 137 is an end-address condenser microphone with a single cardioid polar pattern. Designed for studio use, yet rugged enough for live applications, the KSM137 can withstand extremely high sound pressure levels (SPL). Its low self-noise and extended frequency response make it ideal for recording instruments.

Versatile, durable, and precise, the KSM-137 is an outstanding microphone for instruments ranging from percussion to wind, strings to brass, and piano to guitar.

→ A highly consistent cardioid polar pattern
→ Ultra-thin, 2.5 µm 24 karat gold-layered, low mass Mylar diaphragm for superior transient response
→ Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response, no crossover distortion, and minimal harmonic and intermodulation distortion
→ Premium electronic components, including gold-plated internal and external connectors
→ Subsonic filter eliminates low frequency rumble (less than 17 Hz) caused by mechanical vibration
→ Three-position switchable pad (0 dB, 15 dB, and 25 dB) for handling extremely high sound pressure levels (SPLs)
→ Three-position switchable low-frequency filter reduces background noise and counteracts proximity effect

Cartridge Type	Electret Condenser
Frequency Response	20 to 20,000 Hz
Output Impedance	150 ohms
Sensitivity (at 1kHz, open circuit voltage)	-37 dBV/Pa; 1 Pascal=94 dB SPL
Power Requirements	48 Vdc phantom. 4.7 mA
Common Mode Rejection	>50 dB, 10 Hz to 100 kHz
Polarity	Positive pressure on front diaphragm produces positive voltage on output pin 2 relative to pin 3
Polar Pattern	Cardioid
Sensitivity (at 1 kHz, open circuit voltage)	-37 dBV/Pa; 1 Pascal=94 dB SPL
Self-noise (typical, equivalent SPL; A-weighted)	14 dB
Maximum SPL (1 kHz at 1% THD)THD of microphone preamplifier when applied input signal is equivalent to cartridge output at specified SPL	1000 ohms load: 134 dB (159 dB, -25 Pad); 2500 ohms load: 139 dB (164 dB, -25 Pad); 5000 ohms load: 145 dB (170 dB, -25 Pad)
Clipping Level (20Hz-20 kHz at 1% THD)	1000 ohms load: 3 dBV; 2500 ohms load: 9 dBV; 5000 ohms load: 15 dBV
Dynamic Range (at 1 kHz)	1000 ohms load: 120 dB; 2500 ohms load: 125 dB; 5000 ohms load: 131 dB
Signal to Noise ratio (referenced at 94 dB SPL at 1 kHz)	14 dB
Weight Net	100 g (3.5 oz.)